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Journal of Sensors
Volume 2017 (2017), Article ID 9819214, 13 pages
https://doi.org/10.1155/2017/9819214
Research Article

Landslide Monitoring Network Establishment within Unified Datum and Stability Analysis in the Three Gorges Reservoir Area

1School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China
3Liaoning Bureau of Surveying, Mapping and Geoinformation Network Center, Shenyang 110034, China

Correspondence should be addressed to Chenfeng Li

Received 8 June 2017; Accepted 9 August 2017; Published 20 September 2017

Academic Editor: Francesco Dell’Olio

Copyright © 2017 Shengxiang Huang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A landslide monitoring network construction within unified datum which combined fiducial points, working reference points, and monitoring points was intensively studied in the Three Gorges Reservoir area. With special long and narrow geographical location in the area, designing and building monitoring network was vital to the realization of landslide monitoring. To build such a network with high precision, this paper mainly focused on the following four aspects: () method of using multiple GPS reference stations to build a unified datum network and subnet adjustment, () GPS data processing algorithm with millimeter level, () analysis of influence on the adjustment resulting from systematic error of time evolution datum from different GPS observations, and () establishment and stability analysis of unified datum. Then, using global test and trial-and-error method to analyze the datum based on the GPS observations (2008~2011) of landslide monitoring network in the area, we concluded that there were moved reference points during the three years of high water impoundment, and the horizontal displacement of moved reference points was more than 4 cm, even up to 79.4 cm. The displacement direction of unstable reference points was inspected with geographical environment at sites, which revealed congruency between them.